Between 1972 and 1977, some 70 photographers set about documenting the American landscape, its environmental problems and its people for the then brand-new Environmental Protection Agency. Last summer, the National Archives and Records Administration began posting those Documerica Project images on Flickr.com in what will be a 15,000-shot collection. But 40 years after the EPA's founding, with the climate changing and development marching ever onward, perhaps it's time for a new photoblitz, to see how far we've come -- and how much there is left to do.